139978006640 has 40 divisors (see below), whose sum is σ = 333017451888. Its totient is φ = 54689080320.

The previous prime is 139978006621. The next prime is 139978006657. The reversal of 139978006640 is 46600879931.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20342201 + ... + 20349080.

Almost surely, 2^139978006640 is an apocalyptic number.

139978006640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

139978006640 is an abundant number, since it is smaller than the sum of its proper divisors (193039445248).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

139978006640 is a wasteful number, since it uses less digits than its factorization.

139978006640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40691337 (or 40691331 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 53.

The spelling of 139978006640 in words is "one hundred thirty-nine billion, nine hundred seventy-eight million, six thousand, six hundred forty".